Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Contingency [Line Items]
Loss before income taxes		$ (1,935)	$ (59)	$ (3,887)	$ (1,742)
Income tax (expense) benefit		$ 417	$ 21	$ 816	$ 574
Effective tax rate		21.60%	35.60%	21.00%	33.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%	35.00%	35.00%	35.00%
Internal Revenue Service (IRS) [Member] | Tax Years 2008 and 2009 [Member]
Income Tax Contingency [Line Items]
Income tax (expense) benefit	$ 2
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	22
INCREASE IN NONCURRENT TAX PAYABLE TO PARENT		$ 18
Income Tax Examination, Reclassification To Accumulated Deferred Income Tax Liability	2
Income Tax Payments Assessed But Not Paid	$ 15